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Bosnia and Herzegovina

…south and southwest is the Karst, a region of arid limestone plateaus that contain caves, potholes, and underground drainage. The uplands there are often bare and denuded (the result of deforestation and thin soils), but, between the ridges, depressions known as poljes are covered with alluvial soil that is suitable…

Slovenia

…second major physiographic region, the Kras (Karst), a spur of the lengthy Dinaric Alps in the southwestern part of the country, is dotted with caves and underground rivers, the characteristic features of karst topography (whose term is derived from the name of the region). Although it constitutes one-fourth of Slovenia’s…